Blanketing Valve low pressure reducing valve
Function and Description
The blanketing valve type ZM-R is a highly developed low pressure reducing valve. This valve is typically used to inert or blanket tanks, vessels or other process systems with nitrogen or other blanketing gases by controlling the tank pressure to its desired value. High nitrogen or blanketing gas supply pressures up to 16 bar / 232 psi are safely reduced down to only a few mbar / inch W.C..
The ZM-R low pressure reducing valve is a direct acting one stage pressure control device. It is designed as a membrane controlled, spring loaded proportional acting valve. The valve controls the tank pressure by increasing flow as the tank pressure drops. This means that the mass flow through the device depends on the pressure differential of the set pressure to the actual tank pressure. When the actual tank pressure reaches the set pressure the control unit closes and there is no flow.
At the control membrane (which can be made from PTFE or Viton) the tank pressure (P2) is balanced with the adjustment spring and the supply pressure (P1). In a depressurized tank the adjustment spring holds the valve pallet in the fully open position. As the tankpressure increases the valve pallet moves toward the seat and the mass flow is reduced. When the desired tank pressure is reached the device will close.
Should the tank pressure decrease the valve will open. If the plant is operated in a vacuum mode pressures down to -200 mbar / -80 inch W.C. relative pressure can be accommodated.
Features and Advantages
- one stage pressure reduction within a relatively high pressure range
- large membrane surface to increase the closing force
- all functional and wetted parts are made of stainless steel (or hastelloy if required)
- easy adjustment of set pressure (within the pressure range of the specific spring)
- vertical or horizontal installation (set pressure has to be adjusted for horizontal installation)
- no external energy supply required
- optimized flow performance, which reduces capital cost to a minimum as smaller sized vents are needed
- the valve pallet is guided within the housing to protect against harsh weather conditions, e.g. preventing freezing of pallet in cold weather conditions
- reducing within the vacuum range is possible
- high accuracy
- can be installed in explosion hazardous areas
- housing designed to 16 bar / 150 psi
- maintenance friendly design
-
Dimensions
To select the nominal size (DN), please use the flow capacity charts on the following pages
DN 15 / ½" 25 / 1'' 50 / 2'' 100 / 4'' 15 / ½" 25 / 1'' 50 / 2'' 100 / 4'' a 214 214 – – 8.43 8.43 – – b 168 168 – – 6.61 6.61 – – c* – – 214 / 360 360 / 600 – – 8.43 / 14.17 14.17 / 23.62 d DIN 150 160 150 250 / 250 5.91 6.3 5.91 9.84 / 9.84 ANSI 180 160 150 250 / 250 7.09 6.3 5.91 9.84 / 9.84 e 214 214 230 275 / 310 8.43 8.43 9.06 10.83 / 12.2 f 87 87 103 148 / 155 3.43 3.43 4.06 5.83 / 6.10 Dimensions in mm / inches *depends upon size of diaphragm
DimensionsSelection of valve seat depending on flow rate
Size Seat in mm / inches Kvs Number 25 / 1'' 2,0 / 0.08 0,15 20 4,5 / 0.18 0,60 45 7,5 / 0.30 1,20 75 10,0 / 0.39 1,70 100 14,0 / 0.55 2,40 140 50 / 2'' 14,0 / 0.55 2,80 140 18,0 / 0.71 6,80 180 26,0 / 1.02 14,50 260 100 / 4'' 42,0 / 1.65 33,50 420 55,0 / 2.17 68,00 550 *1 Kvs = 0.86 Cv; 1 Cv = 1.17 Kvs
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Material selection for housing
Design S H Housing Stainless Steel Hastelloy Valve seat Stainless Steel Hastelloy Valve pallet Stainless Steel Hastelloy Valve seat sealing FFKM FFKM Gasket PTFE PTFE Diaphragm P PTFE PTFE Marking P Alternative: Diaphragm V Viton - Marking V Optional: Inner part of housing electropolished. Special materials upon request
-
Type of connection
FD DIN 2501, PN 16 DIN FA ASME B16.5; 150 lbs RFSF ASME G Thread G or NPT other types upon request
Flow rates for P2 pressure range (Europe - metric units)ZM-R 15 / ZM-R 25: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open
Flow rates for P2 pressure range (Europe - metric units)P 1 (bar) 0,15 0,25 0,40 0,65 1,00 1,50 2,50 4,00 6,00 10,00 Sitz-Ø P 2 (bar) [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [mm] 10 6,2
12,4
17,5
24,88,1
16,2
23,0
32,510,3
20,7
29,3
41,413,2
26,5
37,6
53,116,5
33,0
46,7
66,020,6
41,2
58,4
82,428,8
57,6
81,6
115,241,1
82,2
116,5
164,557,5
115,0
163,0
230,190,3
180,7
256,0
361,4Ø4,5
Ø7,5
Ø10,0
Ø14,020 6,0
12,0
17,0
24,07,9
15,9
22,6
31,910,2
20,5
29,1
41,113,2
26,4
37,5
52,916,5
33,0
46,7
66,020,6
41,2
58,4
82,428,8
57,6
81,6
115,241,1
82,2
116,5
164,557,5
115,0
163,0
230,190,3
180,7
256,0
361,4Ø4,5
Ø7,5
Ø10,0
Ø14,0100 3,8
7,7
10,9
15,46,7
13,4
18,9
26,89,4
18,9
26,8
37,912,8
25,6
36,3
51,316,4
32,8
46,5
65,620,6
41,2
58,4
82,428,8
57,6
81,6
115,241,1
82,2
116,5
164,557,5
115,0
163,0
230,190,3
180,7
256,0
361,4Ø4,5
Ø7,5
Ø10,0
Ø14,0200 -
-
-
-4,0
8,0
11,4
16,18,00
16,1
22,9
32,312,1
24,2
34,3
48,416,1
32,3
45,8
64,620,6
41,2
58,4
82,428,8
57,6
81,6
115,241,1
82,2
116,5
164,557,5
115,0
163,0
230,190,3
180,7
256,0
361,4Ø4,5
Ø7,5
Ø10,0
Ø14,0500 -
-
-
--
-
-
--
-
-
-7,8
15,6
22,1
31,214,2
28,5
40,4
57,020,1
40,3
57,1
80,728,8
57,6
81,6
115,241,1
82,2
116,5
164,557,5
115,0
163,0
230,190,3
180,7
256,0
361,4Ø4,5
Ø7,5
Ø10,0
Ø14,0ZM-R 50: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open
Flow rates for P2 pressure range (Europe - metric units)P 1 (bar) 0,15 0,25 0,40 0,65 1,00 1,50 2,50 4,00 6,00 10,00 Sitz-Ø P 2 (bar) [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [mm] 10 28,9
70,3
150,037,9
92,1
196,548,3
117,4
250,461,9
150,4
320,877,0
187,1
399,196,2
233,6
498,3134,5
326,6
696,5191,9
466,1
994,0268,5
652,1
1390421,6
1024
2183Ø14,0
Ø18,0
Ø26,020 28,0
68,1
145,337,3
90,6
193,347,9
116,5
248,461,7
150,0
319,977,0
187,1
399,096,2
233,6
498,3134,5
326,6
696,5191,9
466,1
994,0268,5
652,1
1390421,6
1024
2183Ø14,0
Ø18,0
Ø26,0100 18,0
43,8
93,531,2
75,9
162,044,2
107,4
229,159,9
145,5
310,276,6
186,1
396,996,2
233,6
498,3134,5
326,6
696,5191,9
466,1
994,0268,5
652,1
1390421,6
1024
2183Ø14,0
Ø18,0
Ø26,0200 -
-
-18,8
45,8
97,637,7
91,6
195,356,5
137,4
293,075,4
183,2
390,696,2
233,6
498,3134,5
326,6
696,5191,9
466,1
994,0268,5
652,1
1390421,6
1024
2183Ø14,0
Ø18,0
Ø26,0500 -
-
--
-
--
-
-36,4
88,6
188,966,6
161,7
344,994,1
228,7
487,8134,5
326,6
696,5191,9
466,1
994,0268,5
652,1
1390421,6
1024
2183Ø14,0
Ø18,0
Ø26,0ZM-R 100: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open
P 1 (bar) 0,15 0,25 0,40 0,65 1,00 1,50 2,50 4,00 6,00 10,00 Sitz-Ø P 2 (bar) [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [Nm³ / h] [mm] 10 346
703453
921587
1174741
1504922
18711151
23361609
32662296
46613212
65125045
10241Ø42,0
Ø55,020 335
681446
906574
1165739
1500921
18711151
23361609
32662296
46613212
65125045
10241Ø42,0
Ø55,0100 216
438374
759529
1074716
1455917
18611151
23361609
32662296
46613212
65125045
10241Ø42,0
Ø55,0200 -
-225
458451
916676
1374902
18321151
23361609
32662296
46613212
65125045
10241Ø42,0
Ø55,0500 -
--
--
-436
886796
16171127
22871609
32662296
46613212
65125045
10241Ø42,0
Ø55,0Flow rates for P2 vacuum range (Type ZM-R/N) upon request
Design Types and SpecificationsTwo different designs are available:
Blanketing valve for overpressure, standard design ZM-R –
Blanketing valve for vacuum, standard design ZM-R / N
Other special devices can be supplied on request
Settings
For in-line valves any back pressure, which will influence the set pressure and opening characteristics, has to be taken into account.Supply pressure:
+16 bar +6424 inch W.C. Set pressure for overpressure function:
+500 mbar +200 inch W.C. Set pressure for vacuum function:
-200 mbar -80 inch W.C.
